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chemical substances secreted by cells into the extracellular fluids that regulate metabolic function of other cells in the body

amino acid base or steroid

hormones can be classified chemically as

amino acid base

most hormones are


synthesized from cholesterol

gonadal and adrenocortical

of the hormones produced by the major endocrine organs, only ______ and _______ hormones are steroids


include leukotrienes and prostaglandins


biologically active lipids made from arachidonic acid


released by nearly all cell membranes


signaling chemicals that mediate inflammation and some allergic reactions


have multiple targets and effects ranging from raising blood pressure and increasing the expulsive uterine contractions of birth to enhancing blood clotting, pain, and inflammation

highly localized

the effects of eicosanoids are typically:

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